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Synology NAS User's Guide
Based on DSM 6.1
27 Chapter 5: Manage Storage Space
RAID Type HDD #
Allowed
Failed HDD #
Description Capacity
RAID 1 2-4 (HDD #) - 1
The system will write identical data to each hard
drive at the same time, so data integrity is
protected when at least one disk is normal.
Smallest HDD
size
RAID 5 ≧ 3 1
This configuration includes a backup option. It
uses parity mode to store redundant data on
space equal to the size of one disk for later data
recovery.
(HDD # – 1) x
(Smallest HDD
size)
RAID 5+Spare ≧ 4 2
A RAID 5+Spare storage space requires at least
four drives, one of which will act as a hot spare
drive to rebuild the failed drive of the volume
automatically.
(HDD # – 2) x
(Smallest HDD
size)
RAID 6
≧
4 2
RAID 6 provides extra data protection. It uses
parity mode to store redundant data on space
equal to the size of two disks for later data
recovery.
(HDD # – 2) x
(Smallest HDD
size)
RAID 10
≧
4
(even
number)
1 HDD within
each RAID 1
group / Half of
the total HDD
RAID 10 has the performance of RAID 0 and
data protection level of RAID 1. RAID 10
combines two hard drives into a RAID 1 group,
and combines all the groups with RAID 0.
(HDD # / 2) x
(Smallest HDD
size)
Create Disk Groups
As stated above, creating Disk Groups provides more flexibility when managing storage spaces. Disk Groups can
be created within the volume creation setup wizard, or you can go to Storage Manager > Disk Group and click
Create.
Repair Volumes or Disk Groups
The repair function is available for RAID 1, RAID 10, RAID 5, RAID 5+Spare, RAID 6, and SHR volumes or Disk
Groups. Depending on your RAID types, when one of the hard drives in the volume or Disk Group fails, it will be
in the degraded mode. You can repair the volume or Disk Group by replacing the crashed disk(s) to keep the
data on the volume or Disk Group protected. For more detailed instructions, please see DSM Help.
Change RAID Type
The RAID types of existing volumes and Disk Groups can be changed without losing existing data, allowing you
to easily and economically manage storage capacity. For example, you can create a RAID 1 volume on your
Synology NAS, and later change to RAID 5 if you install more hard disks.
The sections below provide basic information regarding changing RAID types. For more detailed instructions,
please see DSM Help.
Supported RAID Types
RAID types can be changed as follows.
RAID Type
Can be changed to...
Basic RAID 1, RAID 5, RAID 5+Spare
RAID 1 RAID 5, RAID 5+Spare
RAID 5 RAID 5+Spare, RAID 6
Add mirror disk to RAID 1 RAID 1
SHR-1 SHR-2
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